On the sound absorption of double-layered structures coated with acoustic absorption layers
ZHANG Hao1 LIU Bilong2 SU Zhengtao1
1.Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials and Application Research for Vibration and Noise Reduction, Beijing, 100095;
2. Key Laboratory of Noise and Vibration Research, Institute of Acoustics,Chinese Academy of Sciences, Beijing, 100190
Sound absorption of double-layered steel structures coated with acoustic absorption layers is investigated. By introducing interface area factor into wave propagating theory of multiple-layered medium, the effect of acoustic coating is investigated with improved transfer matrix method. Numerical results reveal that the coating on the inner plate could reduce the effect of cavity resonance of the water between two steel structures and improve absorption coefficient significantly at lower frequency range, while the coating on outer plate has little effect on the cavity resonance.
张 浩1 刘碧龙2 苏正涛1. 双层结构敷设声学覆盖层的吸声特性研究[J]. 振动与冲击, 2015, 34(23): 31-36.
ZHANG Hao1 LIU Bilong2 SU Zhengtao1. On the sound absorption of double-layered structures coated with acoustic absorption layers. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(23): 31-36.
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